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Novel Data Placement Algorithm for Distributed Storage System Based on Fault-Tolerant Domain

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Journal of Shanghai Jiaotong university(Science) 2021年第4期26卷 463-470页

作者： SHI Lianxing wang zhiheng LI Xiaoyong School of Cyber Science and Engineering Shanghai Jiao Tong UniversityShanghai200240China School of Electronic Information Engineering Shanghai DianJi UniversityShanghai200240China

The 3-replica redundancy strategy is widely used to solve the problem of data reliability in large-scale distributed storage systems. However, its storage capacity utilization is only 33%. In this paper, a data placement algorithm based on fault-tolerant domain (FTD) is proposed. Owing to the fine-grained design of the FTD, the data reliability of systems using two replicas is comparable to that of current mainstream systems using three replicas, and the capacity utilization is increased to 50%. Moreover, the proposed FTD provides a new concept for the design of distributed storage systems. Distributed storage systems can take FTDs as the units for data placement, data migration, data repair and so on. In addition, fault detection can be performed independently and concurrently within the FTDs.

关键词： data reliability failure domain fault-tolerant domain data placement storage system distributed system

Spatiotemporal variation in leaf size and shape in response to climate

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Journal of Plant Ecology 2020年第1期13卷 87-96页

作者： Yaoqi Li Dongting Zou Nawal Shrestha Xiaoting Xu Qinggang wang Wen Jia zhiheng wang Institute of Ecology and Key Laboratory for Earth Surface Processes of the Ministry of Education College of Urban and Environmental SciencesPeking UniversityBeijing 100871China Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education College of Life SciencesSichuan UniversityChengdu 610065SichuanChina Department of Ecology College of Resources and Environmental SciencesChina Agricultural UniversityBeijing 100193China

Aims Morphological variation of leaves is a key indicator of plant response to climatic *** size and shape are associated with carbon,water and energy exchange of plants with their ***,whether and how leaf size and shape responded to climate change over the past decades remains poorly ***,many studies have only explored inter-but not intraspecific variation in leaf size and shape across space and *** We collected>6000 herbarium specimens spanning 98 years(1910–2008)in China for seven representative dicot species and measured their leaf length and *** explored geographical patterns and temporal trends in leaf size(*** length,leaf width and length×width product)and shape(***/width ratio),and investigated the effects of changes in precipitation and temperature over time and space on the variation in leaf size and *** Findings After accounting for the effects of sampling time,leaf size decreased with latitude for all species combined,but the relationship varied among *** size and shape were positively correlated with temperature and precipitation across *** accounting for the effects of sampling locations,leaf size of all species combined increased with *** size changes over time were mostly positively correlated with precipitation,whereas leaf shape changes were mostly correlated with ***,our results indicate significant spatial and temporal intraspecific variation in leaf size and shape in response to *** study also demonstrates that herbarium specimens collected over a considerable period of time provide a good resource to study the impacts of climate change on plant morphological traits.

关键词： climate change geographical patterns herbarium specimens leaf traits paleo-climate reconstruction

Preoperative diagnosis of malignant pulmonary nodules in lung cancer screening with a radiomics nomogram

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Cancer Communications 2020年第1期40卷 16-24页

作者： Ailing Liu zhiheng wang Yachao Yang Jingtao wang Xiaoyu Dai Lijie wang Yuan Lu Fuzhong Xue Department of Pulmonary and Critical Care Medicine Weihai Municipal HospitalWeihaiShandong 264200P.R.China Department of Biostatistics School of Public HealthShandong UniversityJinanShandong 250002P.R.China Department of Physical Examination Weihai Municipal HospitalWeihaiShandong 264200P.R.China Institute for Medical Dataology Shandong UniversityJinanShandong 250002P.R.China

Background:Lung cancer is the most commonly diagnosed cancer *** survival rate can be significantly improved by early *** based on radiomics features have been found to provide important physiological information on tumors and considered as having the potential to be used in the early screening of lung *** this study,we aim to establish a radiomics model and develop a tool to improve the discrimination between benign and malignant pulmonary ***:A retrospective study was conducted on 875 patients with benign or malignant pulmonary nodules who underwent computed tomography(CT)examinations between June 2013 and June *** assigned 612 patients to a training cohort and 263 patients to a validation *** features were extracted from the CT images of each *** absolute shrinkage and selection operator(LASSO)was used for radiomics feature selection and radiomics score *** logistic regression analysis was used to develop a classification model and radiomics *** score and clinical variables were used to distinguish benign and malignant pulmonary nodules in logistic *** performance of the radiomics nomogram was evaluated by the area under the curve(AUC),calibration curve and Hosmer-Lemeshow test in both the training and validation ***:A radiomics score was built and consisted of 20 features selected by LASSO from 1288 radiomics features in the training *** multivariate logistic model and radiomics nomogram were constructed using the radiomics score and patients’*** discrimination of benign and malignant pulmonary nodules was obtained from the training cohort(AUC,0.836;95%confidence interval[CI]:0.793-0.879)and validation cohort(AUC,0.809;95%CI:0.745-0.872).The Hosmer-Lemeshow test also showed good performance for the logistic regression model in the training cohort(P=0.765)and validation cohort(P=0.064).Good alignment with the calibration curve

关键词： computed tomography early screening lung cancer nomogram pulmonary nodule radiomics

Exploring effects of tensor force and its strength via neutron drops

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Chinese Physics C 2021年第6期45卷 149-157页

作者： zhiheng wang Tomoya Naito Haozhao Liang Wen Hui Long School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China Department of Physics Graduate School of ScienceThe University of TokyoTokyo 113-0033Japan RIKEN Nishina Center Wako 351-0198Japan Joint Department for Nuclear Physics Lanzhou University and Institute of Modern PhysicsChinese Academy of SciencesLanzhou 730000China

The tensor-force effects on the evolution of spin-orbit spittings in neutron drops are investigated within the framework of the relativistic Hartree-Fock *** a fair comparison on the pure mean-field level,the results of the relativistic Brueckner-Hartree-Fock calculation with the Bonn A interaction are adopted as *** a quantitative analysis,we certify that theπ-pscudovector(π-PV)coupling affects the evolutionary trend through the embedded tensor *** strength of the tensor force is explored by enlarging the strength fr of theπ-PV *** is found that weakening the density dependence of fn is slightly better than enlarging it with a *** thus provide a semiquantitative support for the renormalization persistency of the tensor force within the frame-work of density functional *** will serve as important guidance for further development of relativistic effective interactions with particular focus on the tensor force.

关键词： tensor force relativistic Hartree-Fock theory neutron drop tensor renormalization persistency

A high-quality,phased genome assembly of broomcorn millet reveals the features of its subgenome evolution and 3D chromatin organization

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Plant Communications 2023年第3期4卷 3-6页

作者： zhiheng wang Shihui Huang Zhengyue Yang Jinsheng Lai Xiang Gao Junpeng Shi State Key Laboratory of Biocontrol School of AgricultureSun Yat-sen UniversityShenzhen 518107China School of Biomedical Sciences Faculty of MedicineThe Chinese University of Hong KongHong Kong SARChina College of Agronomy and Biotechnology China Agricultural UniversityBeijing 100193China State Key Laboratory of Plant Physiology and Biochemistry&National Maize Improvement Center Department of Plant Genetics and BreedingChina Agricultural UniversityBeijing 100193China These authors contributed equally to this article

Dear Editor,Grasses of the genus Panicumgrowin natural and agricultural ecosystems worldwide and include about 450 species distributed throughout tropical and temperate *** Panicumgrasses remain unexploited,with the exceptions of broomcorn millet(***)(Shi et al.,2019;Zou et al.,2019),switchgrass(***)(Lovell et al.,2021),Hall’s panicgrass(***)(Lovell et al.,2018),and a few other species that have been successfully domesticated into staple,forage,and energy *** millet(2n=4x=36)is probably one of the earliest domesticated grain crops,originating in North China around 10000 years ago.

关键词： evolution crops temperate

Tailoring Excited State Properties and Energy Levels Arrangement via Subtle Structural Design on D-π-A Materials

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Chinese Journal of Chemistry 2017年第10期35卷 1559-1568页

作者： Xiaoming Liang zhiheng wang Liangxuan wang Muddasir Hanif Dehua Hu Shijian Su Zengqi Xie Yu Gao Bing Yang Yuguang Ma Institute of Polymer Optoelectronie Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou Guangdong 510640 China State Key Laboratory of Supramolecular Structure and Materials Jilin University Changchun Jilin 130012 China

The donor-n-conjugated-acceptor （D-n-A） structure is an important design for the luminescent materials be- cause of its diversity in the selections of donor, n-bridge and acceptor groups. Herein, we demonstrate two examples of D-^-A structures capable to finely modulate the excited state properties and arrangement of energy levels, TPA-AN-BP and CZP-AN-BP, which possess the same acceptor and n-bridge but different donor. The investigation of their photophysical properties and DFT calculation revealed that the D-n-A structure with proper donor, n-bridge and acceptor can result in separation of frontier molecular orbitals on the corresponding donor and acceptor with an obvious overlap on the n-bridge, resulting in a hybridized local and charge-transfer （HLCT） excited state with high photoluminescent （PL） efficiencies. Meanwhile, their singlet and triplet states are arranged on corresponding moie- ties with large energy gap between T2 and T1, and a small energy gap between S1 and T2, which favor the reverse intersystem crossing （RISC） from high-lying triplet levels to singlet levels. As a result, the sky-blue emission non-doped OLED based on the TPA-AN-BP reached maximum external quantum efficiency （EQE） of 4.39% and a high exciton utilization efficiency （EUE） of 77%. This study demonstrates a new strategy to construct highly effi- cient OLED materials.

关键词： D-π-A organic light emitting diode exciton utilization hybridized local and charge-transfer reverse intersystem crossing

Climate change filtered out resource-acquisitive plants in a temperate grassland in Inner Mongolia,China

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Science China(Life Sciences) 2024年第2期67卷 403-413页

作者： Heying Jing Xingshuo Xiong Feng Jiang Xucai Pu Wenhong Ma Daijiang Li Zhongling Liu zhiheng wang Institute of Ecology and Key Laboratory for Earth Surface Processes of the Ministry of Education College of Urban and Environmental SciencesPeking UniversityBeijing 100871China Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau School of Ecology and EnvironmentInner Mongolia UniversityHohhot 010021China Department of Biological Sciences Louisiana State UniversityBaton RougeLA 70803USA

Global climate change has led to the decline of species and functional diversity in ecosystems,changing community composition and ecosystem ***,we still know little about how species with different resource-use strategies(different types of resource usage and plant growth of plants as indicated by the spectrum of plant economic traits,including acquisitive resource-use strategy and conservative resource-use strategy)would change in response to climate change,and how the changes in the diversity of species with different resource-use strategies may influence community-level ***,using long-term(1982–2017)observatory data in a temperate grassland in Inner Mongolia,we investigated how climate change had affected the species richness(SR)and functional richness(FRic)for the whole community and for species with different resource-use ***,based on data for four traits representing leaf economics spectrum(leaf carbon concentration,leaf nitrogen concentration,leaf phosphorus concentration,and specific leaf area),we divided 81 plant species appearing in the grassland community into three plant functional types representing resource-acquisitive,medium,and resource-conservative *** then analyzed the changes in community-level productivity in response to the decline of SR and FRic at the community level and for different resource-use *** found that community-level SR and FRic decreased with drying climate,which was largely driven by the decline of diversity for resource-acquisitive ***,community-level productivity remained stable because resource-conservative species dominating this grassland were barely affected by climate *** study revealed distinctive responses of species with different resource-use strategies to climate change and provided a new approach based on species functional traits for predicting the magnitude and direction of climate change effects on ecosystem functions.

关键词： biodiversity ecological strategy functional diversity functional trait long-term change species diversity

Pneumatic bio-soft robot module:Structure,elongation and experiment

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International Journal of Agricultural and Biological Engineering 2017年第2期10卷 114-122页

作者： Bao Guanjun Yao Pengfei Xu Zonggui Li Kun wang zhiheng Zhang Libin Yang Qinghua College of Mechanical Engineering Zhejiang University of TechnologyHangzhou 310014China

Soft robotics,often taking inspirations from biomimetics,is an exciting novel research field and has great capability to work with creatures.A new type of bio-soft robot inspired by elephant trunk and octopus was proposed,which has a promising application in robotic agricultural *** two modularized structures,basal segment and caudal segment,were elaborated in *** both have three side chambers and one central chamber,which are reinforced by springs for better stretch performance in axial direction without radial *** the chambers can act as drivers when inflated with compressed *** importantly,the central chamber was designed for regulating the stiffness of the robot module as needed in *** primary static model for axial elongation was established for the fundamental analysis of the bio-soft robot module’s features,such as iso-force,isobaric and isometric *** and experimental results showed that the motion of the proposed bio-soft module has approximate linearity in iso-force and isobaric conditions,and strict linearity in isometric condition.

关键词： bio-soft robot pneumatic muscle actuator static model harvesting robot

Reversible switching between normal and thermally activated delayed fluorescence towards “smart” and single compound whitelight luminescence via controllable conformational distribution

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Science China Chemistry 2018年第6期61卷 677-686页

作者： Zuozheng He Xinyi Cai zhiheng wang Dongjun Chen Yunchuan Li Haobin Zhao Kunkun Liu Yong Cao Shi-Jian Su State Key Laboratory of Luminescent Materials and Devices and Institute of Polymer Optoelectronic Materials and Devices South China University of Technology

An organic compound exhibiting simultaneously reversible switch between its emission colors and luminescence mechanisms,possessing high contrast from deep blue normal fluorescence(NF) to yellow thermally activated delayed fluorescence(TADF),is reported. Based on these two complementary colors, white-light emission combining NF and TADF from a single compound can be achieved in various states. Experimental results and density functional theory calculations indicate that the controllable conformational distribution under thermal and mechanical activation is the mechanism responsible for the reversible switching behavior.

关键词： reversible switching luminescence "smart" luminescent material white-light emission conformational relaxation